Hydrogen return device for fuel cell hydrogen
By using a motor-driven lifting plate and brushes to clean the filter screen, combined with the design of the disassembly and assembly mechanism, the problem of filter screen clogging in the fuel cell hydrogen return device is solved, achieving smooth gas flow, reduced energy consumption, and extended equipment life.
Patent Information
- Application Number
- CN202520552522.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2035-03-27
AI Technical Summary
In existing fuel cell hydrogen recirculation devices, the filter screen is prone to accumulating pollutants such as carbon particles during long-term operation, leading to pore blockage, increased gas pressure loss and energy consumption, and in severe cases, damage to the pumping mechanism.
A motor drives a lifting plate and brushes to clean the filter screen, and a disassembly and assembly mechanism is set up to perform maintenance and replacement when the fuel cell is not working, thus avoiding clogging.
It effectively prevents filter clogging, maintains smooth gas flow, reduces energy consumption, extends equipment life, and avoids damage to the pumping mechanism.
Smart Images
Figure CN223967198U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydrogen recovery device technology, and in particular to a hydrogen recovery device for hydrogen in fuel cells. Background Technology
[0002] With the rapid development of fuel cell technology, the fuel cell stack outlet usually contains unreacted hydrogen and generated water. Efficiently recovering and purifying residual hydrogen is of great significance for reducing operating costs and improving system stability.
[0003] Existing hydrogen recovery devices mostly use fixed metal filters to remove impurities from hydrogen. However, during long-term operation, pollutants such as carbon particles accumulate. When the filter pore blockage rate reaches 30%, the gas pressure loss increases by more than 40%, forcing the pumping mechanism to operate under high load continuously, increasing energy consumption by about 25%, and in severe cases, causing damage to the pumping mechanism. To solve the above problems, this application proposes a hydrogen recovery device for fuel cell hydrogen. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a hydrogen return device for fuel cells. The device uses a motor to drive a lifting plate and a brush to move, which can clean the filter screen and prevent it from becoming clogged. The disassembly and assembly mechanism allows for maintenance and replacement when the fuel cell is not in operation.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A hydrogen recovery device for fuel cells includes a gas-liquid separator. A filter box is located on one side of the gas-liquid separator. The filter box is fixedly connected to a pumping mechanism, which is fixedly connected to a hydrogen collection tank. A filter screen is located inside the filter box. A cleaning mechanism is provided on the filter box. The cleaning mechanism includes a motor located at the top of the filter box and fixedly connected thereto. A reciprocating screw is fixedly connected to the output end of the motor. The reciprocating screw passes through the filter box and is rotatably connected thereto. A lifting plate is fitted onto the outer wall of the reciprocating screw. Two sliding plates are fixedly connected to the inner wall of the filter box. The filter box is equipped with a disassembly and assembly mechanism, which includes a sealing frame installed on and sealed to the filter box. The filter screen is fixedly connected to the rear end of the sealing frame. A handle is installed on the sealing frame, and threaded rods are coaxially fixedly connected to both ends of the handle. A rectangular column is threadedly connected to the outer wall of each of the two threaded rods. The two rectangular columns pass through the sealing frame and are slidably connected to it. Two limiting grooves are provided on the filter box, and the two rectangular columns are respectively inserted into the corresponding limiting grooves.
[0007] Preferably, the side wall of the gas-liquid separator is fixedly connected to a fuel cell stack inlet connection pipe, the end of the fuel cell stack inlet connection pipe is fitted with a flange, and the side wall of the gas-liquid separator is fixedly connected to a delivery pipe, the end of which is fixedly connected to the side wall of the filter box.
[0008] Preferably, the pumping mechanism includes a pump body, an inlet pipe, and an outlet pipe. The inlet pipe is fixedly connected to the side wall of the filter box, the inlet pipe is fixedly connected to the pump body, the pump body is fixedly connected to the outlet pipe, the outlet pipe is fixedly connected to the side wall of the hydrogen collection box, and a one-way valve is installed on the outer wall of the outlet pipe.
[0009] Preferably, the top of the hydrogen collection tank is fixedly connected to a top pipe, a safety valve is installed on the outer wall of the top pipe, and a hydrogen outlet pipe is fixedly connected to the side wall of the hydrogen collection tank, with an electromagnetic valve installed on the outer wall of the hydrogen outlet pipe.
[0010] Preferably, the lifting plate is provided with a plurality of brushes at one end near the filter screen, and the plurality of brushes are arranged to abut against the side wall of the filter screen, and the rear end, upper end and lower end of the filter screen are arranged to abut against the inner wall of the filter box.
[0011] Preferably, the two threaded rods are arranged in opposite directions, and the rectangular column has a rectangular cross-section.
[0012] Preferably, the outer wall of the sealing frame is fixedly connected to two first limiting blocks, and the two threaded rods pass through the corresponding first limiting blocks and are rotatably connected to them. The outer wall of the sealing frame is fixedly connected to two second limiting blocks, and the two rectangular columns pass through the corresponding second limiting blocks and are slidably connected to them.
[0013] Compared with the prior art, the advantages of this utility model are as follows:
[0014] 1. Start the pumping mechanism to separate the gas into gas and liquid through the gas-liquid separator. The dried gas is injected into the filter box, and the particulate impurities in the gas can be filtered through the filter screen to achieve the gas impurity removal operation.
[0015] 2. The motor output drives the reciprocating screw to rotate, causing the lifting plate and brush to move up and down back and forth. The movement of the brush can clean the side wall of the filter screen, preventing the filter screen from becoming clogged and ensuring smooth airflow.
[0016] 3. The operator holds the lever and rotates it to rotate the two threaded rods, causing the rectangular columns on both sides to move relative to each other until both rectangular columns are disengaged from the limiting groove. This allows the sealing frame and filter screen to be pulled out of the filter box, thus enabling the removal of the filter screen and completing the maintenance and replacement of the filter screen.
[0017] In summary, the filter screen can be cleaned by moving the lifting plate and brush driven by the motor, preventing it from becoming clogged. Furthermore, the disassembly and assembly mechanism allows for maintenance and replacement when the fuel cell is not in operation. Attached Figure Description
[0018] Figure 1 This is a first structural schematic diagram of a hydrogen recovery device for a fuel cell proposed in this utility model.
[0019] Figure 2 This is a schematic diagram of the second structure of a hydrogen recovery device for a fuel cell proposed in this utility model.
[0020] Figure 3 This is a schematic diagram of the first cross-section of a hydrogen recirculation device for a fuel cell proposed in this utility model.
[0021] Figure 4 This is a schematic diagram of the second cross-section of a hydrogen recirculation device for a fuel cell proposed in this utility model.
[0022] Figure 5 This is a partial structural schematic diagram of a hydrogen recovery device for a fuel cell proposed in this utility model.
[0023] In the diagram: 1. Gas-liquid separator, 2. Filter box, 3. Pumping mechanism, 4. Hydrogen collection box, 5. Fuel cell stack inlet connection pipe, 6. Delivery pipe, 7. Top pipe, 8. Hydrogen outlet pipe, 9. Filter screen, 10. Motor, 11. Reciprocating screw, 12. Lifting plate, 13. Sliding rod, 14. Sealing frame, 15. Hand rod, 16. Threaded rod, 17. Rectangular column, 18. Limiting groove. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0025] Reference Figures 1-5 A hydrogen recirculation device for fuel cells includes a gas-liquid separator 1, a filter box 2 on one side of the gas-liquid separator 1, a fuel cell stack inlet connection pipe 5 fixedly connected to the side wall of the gas-liquid separator 1, a flange installed at the end of the fuel cell stack inlet connection pipe 5, and the end of the fuel cell stack inlet connection pipe 5 can be connected to the fuel cell by bolts for recirculation of unreacted hydrogen at the stack outlet, and a delivery pipe 6 fixedly connected to the side wall of the gas-liquid separator 1, the end of the delivery pipe 6 being fixedly connected to the side wall of the filter box 2.
[0026] A pumping mechanism 3 is fixedly connected to a filter box 2, and a hydrogen collection box 4 is fixedly connected to a pumping mechanism 3. The pumping mechanism 3 includes a pump body, an inlet pipe, and an outlet pipe. The inlet pipe is fixedly connected to the side wall of the filter box 2, the pump body, and the outlet pipe. The outlet pipe is fixedly connected to the side wall of the hydrogen collection box 4. A one-way valve is installed on the outer wall of the outlet pipe to prevent high-pressure gas in the hydrogen collection box 4 from flowing back through the outlet pipe. A top pipe 7 is fixedly connected to the top of the hydrogen collection box 4. A safety valve is installed on the outer wall of the top pipe 7 to prevent excessive gas pressure in the hydrogen collection box 4 from causing danger and to release pressure in time. A hydrogen outlet pipe 8 is fixedly connected to the side wall of the hydrogen collection box 4. A solenoid valve is installed on the outer wall of the hydrogen outlet pipe 8 to discharge the recovered hydrogen for reuse.
[0027] The filter box 2 is equipped with a filter screen 9 inside. The rear end, upper end, and lower end of the filter screen 9 are all set against the inner wall of the filter box 2. The filter screen 9 can filter the gas and remove particulate impurities from the air. The filter box 2 is equipped with a cleaning mechanism, which includes a motor 10 set on the top of the filter box 2 and fixedly connected to it. The output end of the motor 10 is fixedly connected to a reciprocating screw 11. The reciprocating screw 11 passes through the filter box 2 and is rotatably connected to it. A lifting plate 12 is sleeved on the outer wall of the reciprocating screw 11. Multiple brushes are set on the end of the lifting plate 12 near the filter screen 9. The multiple brushes are all set against the side wall of the filter screen 9. Two sliding rods 13 are fixedly connected to the inner wall of the filter box 2. The two sliding rods 13 pass through the lifting plate 12 and are slidably connected to it. The filter screen 9 can be cleaned by the lifting and lowering movement of the brushes to prevent it from becoming blocked.
[0028] The filter box 2 is equipped with a disassembly and assembly mechanism. When the fuel cell is not working, the filter screen 9 can be disassembled and assembled through the disassembly and assembly mechanism without causing hydrogen leakage. The disassembly and assembly mechanism includes a sealing frame 14 installed on the filter box 2 and sealed thereto. The filter screen 9 is fixedly connected to the rear end of the sealing frame 14. A handle 15 is installed on the sealing frame 14. Both ends of the handle 15 are coaxially fixedly connected to threaded rods 16. The threads of the two threaded rods 16 are arranged in opposite directions, which can make the rectangular columns 17 on both sides move relative to each other or away from each other. The rectangular columns 17 have a rectangular cross-section, which can limit the rectangular columns 17 to slide only. The outer walls of the two threaded rods 16 are fitted with The filter box 2 is provided with two rectangular columns 17 threadedly connected to it. Both rectangular columns 17 pass through the sealing frame 14 and are slidably connected to it. Two limiting grooves 18 are provided on the filter box 2. The two rectangular columns 17 are respectively inserted into the corresponding limiting grooves 18. Two first limiting blocks are fixedly connected to the outer wall of the sealing frame 14. Two threaded rods 16 pass through the corresponding first limiting blocks and are rotatably connected to them. Two second limiting blocks are fixedly connected to the outer wall of the sealing frame 14. The two rectangular columns 17 pass through the corresponding second limiting blocks and are slidably connected to them. The filter screen 9 and the sealing frame 14 can be removed through the disassembly and assembly mechanism for maintenance and replacement.
[0029] In this invention, the operator connects the fuel cell stack inlet pipe 5 to the fuel cell stack inlet with bolts, starts the pumping mechanism 3, and uses the pumping mechanism 3 to draw away the gas in the filter box 2 to create a negative pressure, drawing unreacted hydrogen from the stack outlet back to the inlet. The gas is then separated into liquid and gas by the gas-liquid separator 1, separating liquid water from the hydrogen to prevent liquid water from entering the stack and causing performance degradation. Subsequently, the dry gas is injected into the filter box 2, where particulate impurities are filtered through the filter screen 9, achieving impurity removal. Finally, the hydrogen is injected into the hydrogen collection box 4 through the inlet and outlet pipes, achieving hydrogen collection. The motor 10 is periodically started (started for 5 minutes every 8 hours), and the output of the motor 10 drives the reciprocating screw 11 to rotate, causing the lifting plate 12 and the brush to rise and fall. The filter screen 9 can be cleaned by moving back and forth with a brush, preventing clogging and ensuring smooth airflow. When the filter screen 9 needs maintenance or replacement, the operator holds the handle 15 and rotates it to rotate the two threaded rods 16, causing the rectangular posts 17 on both sides to move relative to each other until both rectangular posts 17 are disengaged from the limiting grooves 18. This allows the sealing frame 14 and the filter screen 9 to be pulled out of the filter box 2, completing the removal and maintenance of the filter screen 9. Finally, the operator inserts the filter screen 9 and the sealing frame 14 into the filter box 2, holds the handle 15 and rotates it in the opposite direction, causing the rectangular posts 17 on both sides to move back and forth until both rectangular posts 17 are inserted into the limiting grooves 18, completing the sealing installation between the filter box 2 and the sealing frame 14, thus securing the two components.
[0030] This invention uses a motor to move the lifting plate and brush. Through the designed disassembly and assembly mechanism, it solves the problem in the prior art where carbon particles and other pollutants accumulate on the filter screen during long-term operation. When the filter screen pore blockage rate reaches 30%, the gas pressure loss increases by more than 40%, forcing the pumping mechanism to operate under high load continuously, increasing energy consumption by about 25%, and in severe cases, causing damage to the pumping mechanism.
Claims
1. A hydrogen recirculation device for a fuel cell hydrogen, comprising a gas-liquid separator (1), characterized in that, One side of the gas-liquid separator (1) is provided with a filter box (2), the filter box (2) is fixedly connected with a pumping mechanism (3), the pumping mechanism (3) is fixedly connected with a hydrogen collection box (4), the inside of the filter box (2) is provided with a filter screen (9), the filter box (2) is provided with a cleaning mechanism, the filter box (2) is provided with a dismounting mechanism; The cleaning mechanism comprises a motor (10) arranged on the top of the filter box (2) and fixedly connected with the filter box (2), an output end of the motor (10) is fixedly connected with a reciprocating screw rod (11), the reciprocating screw rod (11) penetrates through the filter box (2) and is rotatably connected with the filter box (2), the outer wall of the reciprocating screw rod (11) is sleeved with a lifting plate (12), the inner wall of the filter box (2) is fixedly connected with two sliding rods (13), the two sliding rods (13) penetrate through the lifting plate (12) and are slidably connected with the lifting plate (12); The dismounting mechanism comprises a sealing frame (14) mounted on the filter box (2) and sealingly arranged with the filter box (2), the filter screen (9) is fixedly connected with the rear end of the sealing frame (14), a hand lever (15) is mounted on the sealing frame (14), both ends of the hand lever (15) are coaxially fixedly connected with threaded rods (16), the outer walls of the two threaded rods (16) are sleeved with rectangular columns (17) which are threadedly connected with the threaded rods (16), the two rectangular columns (17) penetrate through the sealing frame (14) and are slidably connected with the sealing frame (14), two limiting grooves (18) are formed in the filter box (2), the two rectangular columns (17) are respectively inserted into the corresponding limiting grooves (18).
2. The hydrogen recycling device for fuel cell hydrogen according to claim 1, characterized by The side wall of the gas-liquid separator (1) is fixedly connected with a fuel cell stack inlet connecting pipe (5), a flange plate is mounted at the end of the fuel cell stack inlet connecting pipe (5), the side wall of the gas-liquid separator (1) is fixedly connected with a conveying pipe (6), the end of the conveying pipe (6) is fixedly connected with the side wall of the filter box (2).
3. The hydrogen recycling device for fuel cell hydrogen according to claim 1, characterized by The pumping mechanism (3) comprises a pump body, an air inlet pipe and an air outlet pipe, the air inlet pipe is fixedly connected with the side wall of the filter box (2), the air inlet pipe is fixedly connected with the pump body, the pump body is fixedly connected with the air outlet pipe, the air outlet pipe is fixedly connected with the side wall of the hydrogen collection box (4), and a one-way valve is mounted on the outer wall of the air outlet pipe.
4. The hydrogen recycling device for fuel cell hydrogen according to claim 1, characterized by The top of the hydrogen collection box (4) is fixedly connected with a top pipe (7), a safety valve is mounted on the outer wall of the top pipe (7), the side wall of the hydrogen collection box (4) is fixedly connected with a hydrogen outlet pipe (8), and an electromagnetic valve is mounted on the outer wall of the hydrogen outlet pipe (8).
5. The hydrogen recycling device for fuel cell hydrogen according to claim 1, characterized by The end of the lifting plate (12) close to the filter screen (9) is provided with a plurality of brushes, the plurality of brushes are arranged in abutment with the side wall of the filter screen (9), the rear end, the upper end and the lower end of the filter screen (9) are arranged in abutment with the inner wall of the filter box (2).
6. The hydrogen recycling device for fuel cell hydrogen according to claim 1, characterized by The threaded directions of the two threaded rods (16) are oppositely arranged, and the cross section of the rectangular column (17) is in a rectangular shape.
7. The hydrogen recirculation device for fuel cell hydrogen according to claim 1, characterized by The outer wall of the sealing frame (14) is fixedly connected with two first limiting blocks, two threaded rods (16) respectively penetrate through the corresponding first limiting blocks and are rotationally connected with the first limiting blocks, the outer wall of the sealing frame (14) is fixedly connected with two second limiting blocks, and two rectangular columns (17) respectively penetrate through the corresponding second limiting blocks and are slidingly connected with the second limiting blocks.